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Re: co2 bell jar

> Date: Mon, 30 Jun 1997 11:45:52 -0400 (EDT)
> From: Earle Hamilton <ehami at sunny_ncmc.cc.mi.us>
> re co2 bell jar.  I have the co2 system in the basement and have been
> feeding co2 into a tank upstairs with a 2l pop bottle bottom half
> turned upside down as a bell jar ... So I burped the bell jar and
> emptied it completely and started filling with co2 again.  

Unproven conjecture holds that as the CO2 diffuses into the water from
the bell jar (because the concentration of CO2 is greater in the jar
than the water), other gasses dissolved in the water diffuse into the
bell jar (because the concentration of other gases is greater in the
water than in the jar).  Over time, the atmosphere in the jar contains
lots of N2 and O2 (or just plain air) and the relative CO2
concentration is lower, reducing the rate of CO2 diffusion into the
Yes, bell jar type setups need to be "burped" every day or so to be

Carefully designed reactors that don't allow CO2 to collect at the top
(like the expensive Dupla reactors :-) generally don't have this


Need info?  Check out http://www.frii.com/~booth/AquaticConcepts.htm